BRISKPoints

Description

This object provides the ability to pass data between the detectBRISKFeatures and extractFeatures functions. You can also
use it to manipulate and plot the data returned by these functions.
You can use the object to fill the points interactively in situations
where you might want to mix a non-BRISK interest point detector with
a BRISK descriptor.

Input Arguments

Location — Point locationsM-by-2 array (default)

Properties

Count — Number of points0 (default) | integer

Number of points held by the BRISK object, specified as a numeric value.

Location — Point locationsM-by-2 array (default)

Point locations, specified as an M-by-2 array of [x y] point
coordinates.

Scale — Scale12.0 (default) | scalar

Scale at which the feature is detected, specified as a value greater than or equal
to 1.6.

Metric — Strength of detected feature0.0 (default) | numeric scalar

Strength of detected feature, specified as a numeric value. The BRISK algorithm uses
a determinant of an approximated Hessian.

Orientation — Orientation0.0 (default) | angle in radians

Orientation of the detected feature, specified as an angle, in radians. The angle is
measured counterclockwise from the X-axis with the origin specified by the
Location property. Do not set this property manually. Use the
call to extractFeatures to fill in this value. The
extractFeatures function modifies the
default value of 0.0. Using BRISK interest points to extract a
non-BRISK descriptor, (e.g. SURF, FREAK, MSER, etc.), can alter
Orientation values. The Orientation is mainly useful for visualization purposes.

Tips

Although BRISKPoints can hold many points, it is a
scalar object. Therefore, numel(BRISKPoints) always
returns 1. This value can differ from length(BRISKPoints), which returns the true number of points
held by the object.

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